Dave_Davis - 9:55 pm on Dec 1, 2011 (gmt 0)
I've noticed that 3 of our sites that lost ~50% of traffic on Nov 19th have come back with a vengeance on Tuesday/Wednesday (29th and 30th).
I thought it was just holiday traffic getting my hopes up but after further examination, it's not. It's a massive recovery.
Something interesting to note. All sites that made the recovery now have rich snippets appearing in the SERPS.
Another interesting think to note is that not all pages in each site have the rich snippets, only pages with over 10 retweets, over 5 +1s, and over 50 FB shares.
Not sure which factor it is or a combination just yet.